Here's one from the archives, taken in August at the San Diego DSLR club's group shoot at Belmont Park. The ride is called the "Beach Blaster," and it involves being swung through nearly 180 degrees of arc while simultaneously spinning. I opted not to go on it, and to just take pictures instead.
Technical info: Shot with a Nikon D40 and Nikkor 35mm f/1.8G DX lens, in aperture-priority exposure mode (spot metering). Aperture f/1.8, shutter 1/125 (+0 EV), ISO 1600. Post-processing in Aperture 3: curves for highlight recovery; lightly dodged over the people.
Thoughts for improvement: I actually really like the composition here, the use of negative space and the way the frame cuts off half of the seats. I feel like it gives a sense of action, of falling. The problem is that I cut off just a bit too much of the ride--it would be better if the lights and arm along the left side (left of the frame, top of the ride) weren't cut off, and even better, I think, if you could see the central arm that the seats spun on, which isn't in the frame at all. The girl at the top of the frame also should be a hair lower, so as to avoid cutting off her knee.